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   1 /*
   2  *  IBM eServer eHCA Infiniband device driver for Linux on POWER
   3  *
   4  *  Completion queue handling
   5  *
   6  *  Authors: Waleri Fomin <fomin@de.ibm.com>
   7  *           Khadija Souissi <souissi@de.ibm.com>
   8  *           Reinhard Ernst <rernst@de.ibm.com>
   9  *           Heiko J Schick <schickhj@de.ibm.com>
  10  *           Hoang-Nam Nguyen <hnguyen@de.ibm.com>
  11  *
  12  *
  13  *  Copyright (c) 2005 IBM Corporation
  14  *
  15  *  All rights reserved.
  16  *
  17  *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
  18  *  BSD.
  19  *
  20  * OpenIB BSD License
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions are met:
  24  *
  25  * Redistributions of source code must retain the above copyright notice, this
  26  * list of conditions and the following disclaimer.
  27  *
  28  * Redistributions in binary form must reproduce the above copyright notice,
  29  * this list of conditions and the following disclaimer in the documentation
  30  * and/or other materials
  31  * provided with the distribution.
  32  *
  33  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  34  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  35  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  36  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  37  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  38  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  39  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  40  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  41  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  42  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  43  * POSSIBILITY OF SUCH DAMAGE.
  44  */
  45
  46 #include <linux/slab.h>
  47
  48 #include "ehca_iverbs.h"
  49 #include "ehca_classes.h"
  50 #include "ehca_irq.h"
  51 #include "hcp_if.h"
  52
  53 static struct kmem_cache *cq_cache;
  54
  55 int ehca_cq_assign_qp(struct ehca_cq *cq, struct ehca_qp *qp)
  56 {
  57         unsigned int qp_num = qp->real_qp_num;
  58         unsigned int key = qp_num & (QP_HASHTAB_LEN-1);
  59         unsigned long flags;
  60
  61         spin_lock_irqsave(&cq->spinlock, flags);
  62         hlist_add_head(&qp->list_entries, &cq->qp_hashtab[key]);
  63         spin_unlock_irqrestore(&cq->spinlock, flags);
  64
  65         ehca_dbg(cq->ib_cq.device, "cq_num=%x real_qp_num=%x",
  66                  cq->cq_number, qp_num);
  67
  68         return 0;
  69 }
  70
  71 int ehca_cq_unassign_qp(struct ehca_cq *cq, unsigned int real_qp_num)
  72 {
  73         int ret = -EINVAL;
  74         unsigned int key = real_qp_num & (QP_HASHTAB_LEN-1);
  75         struct hlist_node *iter;
  76         struct ehca_qp *qp;
  77         unsigned long flags;
  78
  79         spin_lock_irqsave(&cq->spinlock, flags);
  80         hlist_for_each(iter, &cq->qp_hashtab[key]) {
  81                 qp = hlist_entry(iter, struct ehca_qp, list_entries);
  82                 if (qp->real_qp_num == real_qp_num) {
  83                         hlist_del(iter);
  84                         ehca_dbg(cq->ib_cq.device,
  85                                  "removed qp from cq .cq_num=%x real_qp_num=%x",
  86                                  cq->cq_number, real_qp_num);
  87                         ret = 0;
  88                         break;
  89                 }
  90         }
  91         spin_unlock_irqrestore(&cq->spinlock, flags);
  92         if (ret)
  93                 ehca_err(cq->ib_cq.device,
  94                          "qp not found cq_num=%x real_qp_num=%x",
  95                          cq->cq_number, real_qp_num);
  96
  97         return ret;
  98 }
  99
 100 struct ehca_qp *ehca_cq_get_qp(struct ehca_cq *cq, int real_qp_num)
 101 {
 102         struct ehca_qp *ret = NULL;
 103         unsigned int key = real_qp_num & (QP_HASHTAB_LEN-1);
 104         struct hlist_node *iter;
 105         struct ehca_qp *qp;
 106         hlist_for_each(iter, &cq->qp_hashtab[key]) {
 107                 qp = hlist_entry(iter, struct ehca_qp, list_entries);
 108                 if (qp->real_qp_num == real_qp_num) {
 109                         ret = qp;
 110                         break;
 111                 }
 112         }
 113         return ret;
 114 }
 115
 116 struct ib_cq *ehca_create_cq(struct ib_device *device, int cqe, int comp_vector,
 117                              struct ib_ucontext *context,
 118                              struct ib_udata *udata)
 119 {
 120         static const u32 additional_cqe = 20;
 121         struct ib_cq *cq;
 122         struct ehca_cq *my_cq;
 123         struct ehca_shca *shca =
 124                 container_of(device, struct ehca_shca, ib_device);
 125         struct ipz_adapter_handle adapter_handle;
 126         struct ehca_alloc_cq_parms param; /* h_call's out parameters */
 127         struct h_galpa gal;
 128         void *vpage;
 129         u32 counter;
 130         u64 rpage, cqx_fec, h_ret;
 131         int ipz_rc, ret, i;
 132         unsigned long flags;
 133
 134         if (cqe >= 0xFFFFFFFF - 64 - additional_cqe)
 135                 return ERR_PTR(-EINVAL);
 136
 137         if (!atomic_add_unless(&shca->num_cqs, 1, shca->max_num_cqs)) {
 138                 ehca_err(device, "Unable to create CQ, max number of %i "
 139                         "CQs reached.", shca->max_num_cqs);
 140                 ehca_err(device, "To increase the maximum number of CQs "
 141                         "use the number_of_cqs module parameter.\n");
 142                 return ERR_PTR(-ENOSPC);
 143         }
 144
 145         my_cq = kmem_cache_zalloc(cq_cache, GFP_KERNEL);
 146         if (!my_cq) {
 147                 ehca_err(device, "Out of memory for ehca_cq struct device=%p",
 148                          device);
 149                 atomic_dec(&shca->num_cqs);
 150                 return ERR_PTR(-ENOMEM);
 151         }
 152
 153         memset(&param, 0, sizeof(struct ehca_alloc_cq_parms));
 154
 155         spin_lock_init(&my_cq->spinlock);
 156         spin_lock_init(&my_cq->cb_lock);
 157         spin_lock_init(&my_cq->task_lock);
 158         atomic_set(&my_cq->nr_events, 0);
 159         init_waitqueue_head(&my_cq->wait_completion);
 160
 161         cq = &my_cq->ib_cq;
 162
 163         adapter_handle = shca->ipz_hca_handle;
 164         param.eq_handle = shca->eq.ipz_eq_handle;
 165
 166         do {
 167                 if (!idr_pre_get(&ehca_cq_idr, GFP_KERNEL)) {
 168                         cq = ERR_PTR(-ENOMEM);
 169                         ehca_err(device, "Can't reserve idr nr. device=%p",
 170                                  device);
 171                         goto create_cq_exit1;
 172                 }
 173
 174                 write_lock_irqsave(&ehca_cq_idr_lock, flags);
 175                 ret = idr_get_new(&ehca_cq_idr, my_cq, &my_cq->token);
 176                 write_unlock_irqrestore(&ehca_cq_idr_lock, flags);
 177         } while (ret == -EAGAIN);
 178
 179         if (ret) {
 180                 cq = ERR_PTR(-ENOMEM);
 181                 ehca_err(device, "Can't allocate new idr entry. device=%p",
 182                          device);
 183                 goto create_cq_exit1;
 184         }
 185
 186         if (my_cq->token > 0x1FFFFFF) {
 187                 cq = ERR_PTR(-ENOMEM);
 188                 ehca_err(device, "Invalid number of cq. device=%p", device);
 189                 goto create_cq_exit2;
 190         }
 191
 192         /*
 193          * CQs maximum depth is 4GB-64, but we need additional 20 as buffer
 194          * for receiving errors CQEs.
 195          */
 196         param.nr_cqe = cqe + additional_cqe;
 197         h_ret = hipz_h_alloc_resource_cq(adapter_handle, my_cq, &param);
 198
 199         if (h_ret != H_SUCCESS) {
 200                 ehca_err(device, "hipz_h_alloc_resource_cq() failed "
 201                          "h_ret=%lli device=%p", h_ret, device);
 202                 cq = ERR_PTR(ehca2ib_return_code(h_ret));
 203                 goto create_cq_exit2;
 204         }
 205
 206         ipz_rc = ipz_queue_ctor(NULL, &my_cq->ipz_queue, param.act_pages,
 207                                 EHCA_PAGESIZE, sizeof(struct ehca_cqe), 0, 0);
 208         if (!ipz_rc) {
 209                 ehca_err(device, "ipz_queue_ctor() failed ipz_rc=%i device=%p",
 210                          ipz_rc, device);
 211                 cq = ERR_PTR(-EINVAL);
 212                 goto create_cq_exit3;
 213         }
 214
 215         for (counter = 0; counter < param.act_pages; counter++) {
 216                 vpage = ipz_qpageit_get_inc(&my_cq->ipz_queue);
 217                 if (!vpage) {
 218                         ehca_err(device, "ipz_qpageit_get_inc() "
 219                                  "returns NULL device=%p", device);
 220                         cq = ERR_PTR(-EAGAIN);
 221                         goto create_cq_exit4;
 222                 }
 223                 rpage = virt_to_abs(vpage);
 224
 225                 h_ret = hipz_h_register_rpage_cq(adapter_handle,
 226                                                  my_cq->ipz_cq_handle,
 227                                                  &my_cq->pf,
 228                                                  0,
 229                                                  0,
 230                                                  rpage,
 231                                                  1,
 232                                                  my_cq->galpas.
 233                                                  kernel);
 234
 235                 if (h_ret < H_SUCCESS) {
 236                         ehca_err(device, "hipz_h_register_rpage_cq() failed "
 237                                  "ehca_cq=%p cq_num=%x h_ret=%lli counter=%i "
 238                                  "act_pages=%i", my_cq, my_cq->cq_number,
 239                                  h_ret, counter, param.act_pages);
 240                         cq = ERR_PTR(-EINVAL);
 241                         goto create_cq_exit4;
 242                 }
 243
 244                 if (counter == (param.act_pages - 1)) {
 245                         vpage = ipz_qpageit_get_inc(&my_cq->ipz_queue);
 246                         if ((h_ret != H_SUCCESS) || vpage) {
 247                                 ehca_err(device, "Registration of pages not "
 248                                          "complete ehca_cq=%p cq_num=%x "
 249                                          "h_ret=%lli", my_cq, my_cq->cq_number,
 250                                          h_ret);
 251                                 cq = ERR_PTR(-EAGAIN);
 252                                 goto create_cq_exit4;
 253                         }
 254                 } else {
 255                         if (h_ret != H_PAGE_REGISTERED) {
 256                                 ehca_err(device, "Registration of page failed "
 257                                          "ehca_cq=%p cq_num=%x h_ret=%lli "
 258                                          "counter=%i act_pages=%i",
 259                                          my_cq, my_cq->cq_number,
 260                                          h_ret, counter, param.act_pages);
 261                                 cq = ERR_PTR(-ENOMEM);
 262                                 goto create_cq_exit4;
 263                         }
 264                 }
 265         }
 266
 267         ipz_qeit_reset(&my_cq->ipz_queue);
 268
 269         gal = my_cq->galpas.kernel;
 270         cqx_fec = hipz_galpa_load(gal, CQTEMM_OFFSET(cqx_fec));
 271         ehca_dbg(device, "ehca_cq=%p cq_num=%x CQX_FEC=%llx",
 272                  my_cq, my_cq->cq_number, cqx_fec);
 273
 274         my_cq->ib_cq.cqe = my_cq->nr_of_entries =
 275                 param.act_nr_of_entries - additional_cqe;
 276         my_cq->cq_number = (my_cq->ipz_cq_handle.handle) & 0xffff;
 277
 278         for (i = 0; i < QP_HASHTAB_LEN; i++)
 279                 INIT_HLIST_HEAD(&my_cq->qp_hashtab[i]);
 280
 281         INIT_LIST_HEAD(&my_cq->sqp_err_list);
 282         INIT_LIST_HEAD(&my_cq->rqp_err_list);
 283
 284         if (context) {
 285                 struct ipz_queue *ipz_queue = &my_cq->ipz_queue;
 286                 struct ehca_create_cq_resp resp;
 287                 memset(&resp, 0, sizeof(resp));
 288                 resp.cq_number = my_cq->cq_number;
 289                 resp.token = my_cq->token;
 290                 resp.ipz_queue.qe_size = ipz_queue->qe_size;
 291                 resp.ipz_queue.act_nr_of_sg = ipz_queue->act_nr_of_sg;
 292                 resp.ipz_queue.queue_length = ipz_queue->queue_length;
 293                 resp.ipz_queue.pagesize = ipz_queue->pagesize;
 294                 resp.ipz_queue.toggle_state = ipz_queue->toggle_state;
 295                 resp.fw_handle_ofs = (u32)
 296                         (my_cq->galpas.user.fw_handle & (PAGE_SIZE - 1));
 297                 if (ib_copy_to_udata(udata, &resp, sizeof(resp))) {
 298                         ehca_err(device, "Copy to udata failed.");
 299                         goto create_cq_exit4;
 300                 }
 301         }
 302
 303         return cq;
 304
 305 create_cq_exit4:
 306         ipz_queue_dtor(NULL, &my_cq->ipz_queue);
 307
 308 create_cq_exit3:
 309         h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
 310         if (h_ret != H_SUCCESS)
 311                 ehca_err(device, "hipz_h_destroy_cq() failed ehca_cq=%p "
 312                          "cq_num=%x h_ret=%lli", my_cq, my_cq->cq_number, h_ret);
 313
 314 create_cq_exit2:
 315         write_lock_irqsave(&ehca_cq_idr_lock, flags);
 316         idr_remove(&ehca_cq_idr, my_cq->token);
 317         write_unlock_irqrestore(&ehca_cq_idr_lock, flags);
 318
 319 create_cq_exit1:
 320         kmem_cache_free(cq_cache, my_cq);
 321
 322         atomic_dec(&shca->num_cqs);
 323         return cq;
 324 }
 325
 326 int ehca_destroy_cq(struct ib_cq *cq)
 327 {
 328         u64 h_ret;
 329         struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
 330         int cq_num = my_cq->cq_number;
 331         struct ib_device *device = cq->device;
 332         struct ehca_shca *shca = container_of(device, struct ehca_shca,
 333                                               ib_device);
 334         struct ipz_adapter_handle adapter_handle = shca->ipz_hca_handle;
 335         unsigned long flags;
 336
 337         if (cq->uobject) {
 338                 if (my_cq->mm_count_galpa || my_cq->mm_count_queue) {
 339                         ehca_err(device, "Resources still referenced in "
 340                                  "user space cq_num=%x", my_cq->cq_number);
 341                         return -EINVAL;
 342                 }
 343         }
 344
 345         /*
 346          * remove the CQ from the idr first to make sure
 347          * no more interrupt tasklets will touch this CQ
 348          */
 349         write_lock_irqsave(&ehca_cq_idr_lock, flags);
 350         idr_remove(&ehca_cq_idr, my_cq->token);
 351         write_unlock_irqrestore(&ehca_cq_idr_lock, flags);
 352
 353         /* now wait until all pending events have completed */
 354         wait_event(my_cq->wait_completion, !atomic_read(&my_cq->nr_events));
 355
 356         /* nobody's using our CQ any longer -- we can destroy it */
 357         h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 0);
 358         if (h_ret == H_R_STATE) {
 359                 /* cq in err: read err data and destroy it forcibly */
 360                 ehca_dbg(device, "ehca_cq=%p cq_num=%x resource=%llx in err "
 361                          "state. Try to delete it forcibly.",
 362                          my_cq, cq_num, my_cq->ipz_cq_handle.handle);
 363                 ehca_error_data(shca, my_cq, my_cq->ipz_cq_handle.handle);
 364                 h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
 365                 if (h_ret == H_SUCCESS)
 366                         ehca_dbg(device, "cq_num=%x deleted successfully.",
 367                                  cq_num);
 368         }
 369         if (h_ret != H_SUCCESS) {
 370                 ehca_err(device, "hipz_h_destroy_cq() failed h_ret=%lli "
 371                          "ehca_cq=%p cq_num=%x", h_ret, my_cq, cq_num);
 372                 return ehca2ib_return_code(h_ret);
 373         }
 374         ipz_queue_dtor(NULL, &my_cq->ipz_queue);
 375         kmem_cache_free(cq_cache, my_cq);
 376
 377         atomic_dec(&shca->num_cqs);
 378         return 0;
 379 }
 380
 381 int ehca_resize_cq(struct ib_cq *cq, int cqe, struct ib_udata *udata)
 382 {
 383         /* TODO: proper resize needs to be done */
 384         ehca_err(cq->device, "not implemented yet");
 385
 386         return -EFAULT;
 387 }
 388
 389 int ehca_init_cq_cache(void)
 390 {
 391         cq_cache = kmem_cache_create("ehca_cache_cq",
 392                                      sizeof(struct ehca_cq), 0,
 393                                      SLAB_HWCACHE_ALIGN,
 394                                      NULL);
 395         if (!cq_cache)
 396                 return -ENOMEM;
 397         return 0;
 398 }
 399
 400 void ehca_cleanup_cq_cache(void)
 401 {
 402         if (cq_cache)
 403                 kmem_cache_destroy(cq_cache);
 404 }